Bad arguments to select list item , the operation select list item cannot acccept the arguments:{"<!doctype"}

[ABG]

The JSON text you supplied is okay.

So the responseContent that arrives is not that JSON text but is something else.

Capture it and display it to see what it is.
(Either using Do It or sending it to a Label.)

FAQ Section: Debugging

Introductory Testing techniques, including Do It - MIT Sample Connect -> Companion sequence - @ABG How to Read and Understand a Runtime Error Message - @ABG Common Runtime Errors - @TimAI2 How to Teach Debugging thread - Feb 2025 Advanced Do It' to view procedure results, event arguments and local variables How to run Logcat How to use Do It in a loop Screen1.ErrorOccured message numbers SteveJG monster list of things you should not do How to show raw responseContent from your app wh…